Puro Sound Labs Puro Limiter 3.5mm Volume-Limiting Auxiliary Audio Cable with Mic. The Puro Limiter was designed to protect developing eardrums while providing the ultimate listening experience. Volume is limited to approximately 85 dB (safe for up to 8 hours of listening per day) for most portable audio players. PREMIUM AUDIO QUALITY Gold-plated connector ensures seamless audio transmission with high quality sound, reduced signal loss and no distortion. BROAD COMPATIBILITY Play audio from any digital device with a 3.5mm audio jack on headphones; universal compatibility with phones, laptops, computers. HASSLE-FREE DESIGN Standard 3.5mm connector works with most devices; no need to remove thin protective cases. Flat design and durable materials prevent tangles and breakage. On-cable indicator provides at-a-glance confirmation that cable is plugged in correctly to limit volume. NOTE Home stereos or other high-powered audio sources may exceed 85 dB. As we cannot test every device, we recommend ensuring that maximum volume is within a comfortable and safe range before playing.